SNLA428 june   2023 DP83826E

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Time Domain Reflectometry
    1. 1.1 Example Connections
      1. 1.1.1 Open Circuit Cable
      2. 1.1.2 Short Circuit Cable
  5. 2TDR Implementation
    1. 2.1 DP83826 TDR Configuration
    2. 2.2 TDR Algorithm
      1. 2.2.1 TDR Algorithm Example Flow
      2. 2.2.2 TDR Algorithm Matlab Example Code
  6. 3Summary
  7. 4References

1.1.1 Open Circuit Cable

Open cable is easy to diagnose since it generates a strong reflection. No reflection is observed on the other channel. The reflection due to the open circuit is in-phase with the transmitted pulse (positive polarity). Any kind of inductive impedance discontinuity generates in-phase reflection and the amplitude depends on the amount of impedance discontinuity.

GUID-AD1AF098-ADAF-4614-8909-CB5541B7F8B9-low.gif Figure 1-1 Open Circuit Cable